package com.zenithmind.document.service.impl;

import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.zenithmind.common.context.UserContext;
import com.zenithmind.document.mapper.DocumentMapper;
import com.zenithmind.document.pojo.domain.Document;
import com.zenithmind.document.pojo.dto.DocumentCreateDTO;
import com.zenithmind.document.pojo.dto.DocumentUpdateDTO;
import com.zenithmind.document.pojo.dto.DocumentUploadDTO;
import com.zenithmind.document.pojo.query.DocumentQueryDTO;
import com.zenithmind.document.pojo.vo.DocumentDetailVO;
import com.zenithmind.document.pojo.vo.DocumentStatisticsVO;
import com.zenithmind.document.pojo.vo.DocumentVO;
import com.zenithmind.document.service.*;
import lombok.RequiredArgsConstructor;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.List;

/**
 * 文档服务实现类（重构版）
 * 遵循组合模式：组合多个专门的服务实现
 * 遵循依赖倒置原则：依赖抽象接口而不是具体实现
 * 遵循单一职责原则：每个方法委托给专门的服务
 * 
 * @author ZenithMind Team
 * @since 2025-01-09
 */
@Slf4j
// @Service("documentServiceNew")  // 暂时禁用，避免Bean冲突
@RequiredArgsConstructor
public class DocumentServiceImplNew extends ServiceImpl<DocumentMapper, Document> implements DocumentService {

    private final DocumentBasicService documentBasicService;
    private final DocumentSearchService documentSearchService;
    private final DocumentProcessService documentProcessService;
    private final DocumentStatisticsService documentStatisticsService;

    // ========== DocumentBasicService 委托方法 ==========

    @Override
    public DocumentVO uploadDocument(DocumentUploadDTO uploadDTO) {
        return documentBasicService.uploadDocument(uploadDTO);
    }

    @Override
    public DocumentVO createDocument(DocumentCreateDTO createDTO) {
        return documentBasicService.createDocument(createDTO);
    }

    @Override
    public Boolean updateDocument(String id, DocumentUpdateDTO updateDTO) {
        return documentBasicService.updateDocument(id, updateDTO);
    }

    @Override
    public Boolean deleteDocument(String id) {
        return documentBasicService.deleteDocument(id);
    }

    @Override
    public Boolean batchDeleteDocuments(List<String> ids) {
        return documentBasicService.batchDeleteDocuments(ids);
    }

    @Override
    public Boolean restoreDocument(String id) {
        return documentBasicService.restoreDocument(id);
    }

    @Override
    public IPage<DocumentVO> getDocumentPage(DocumentQueryDTO queryDTO) {
        return documentBasicService.getDocumentPage(queryDTO);
    }

    @Override
    public DocumentDetailVO getDocumentDetail(String id, String userId) {
        return documentBasicService.getDocumentDetail(id, userId);
    }

    @Override
    public DocumentVO getDocumentById(String id) {
        return documentBasicService.getDocumentById(id);
    }

    @Override
    public Boolean existsDocument(String id) {
        return documentBasicService.existsDocument(id);
    }

    @Override
    public Boolean checkDocumentPermission(String documentId, String userId, String permission) {
        return documentBasicService.checkDocumentPermission(documentId, userId, permission);
    }

    @Override
    public Boolean validateDocumentOwnership(String documentId, String userId) {
        return documentBasicService.validateDocumentOwnership(documentId, userId);
    }

    // ========== DocumentSearchService 委托方法 ==========

    @Override
    public List<DocumentVO> searchDocuments(String keyword, String userId, Integer limit) {
        return documentSearchService.searchDocuments(keyword, userId, limit);
    }

    @Override
    public List<DocumentVO> advancedSearchDocuments(String keyword, String categoryId, 
                                                   String type, String userId, Integer limit) {
        return documentSearchService.advancedSearchDocuments(keyword, categoryId, type, userId, limit);
    }

    @Override
    public List<DocumentVO> searchDocumentsByTags(List<String> tags, String userId, Integer limit) {
        return documentSearchService.searchDocumentsByTags(tags, userId, limit);
    }

    @Override
    public List<DocumentVO> getRelatedDocuments(String documentId, String userId, Integer limit) {
        return documentSearchService.getRelatedDocuments(documentId, userId, limit);
    }

    @Override
    public List<DocumentVO> getRecommendedDocuments(String userId, Integer limit) {
        return documentSearchService.getRecommendedDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getHotDocuments(Integer limit) {
        return documentSearchService.getHotDocuments(limit);
    }

    @Override
    public List<DocumentVO> getLatestDocuments(String userId, Integer limit) {
        return documentSearchService.getLatestDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getFavoriteDocuments(String userId, Integer limit) {
        return documentSearchService.getFavoriteDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getRecentDocuments(String userId, Integer limit) {
        return documentSearchService.getRecentDocuments(userId, limit);
    }

    @Override
    public List<DocumentVO> getUserDocuments(String creatorId, Integer limit) {
        return documentSearchService.getUserDocuments(creatorId, limit);
    }

    @Override
    public List<DocumentVO> getDocumentsByCategory(String categoryId, String userId, Integer limit) {
        return documentSearchService.getDocumentsByCategory(categoryId, userId, limit);
    }

    // ========== DocumentProcessService 委托方法 ==========

    @Override
    public String convertDocument(String id, String targetFormat, String userId) {
        return documentProcessService.convertDocument(id, targetFormat, userId);
    }

    @Override
    public String extractDocumentContent(String id) {
        return documentProcessService.extractDocumentContent(id);
    }

    @Override
    public String generateDocumentSummary(String id) {
        return documentProcessService.generateDocumentSummary(id);
    }

    @Override
    public String generateDocumentPreview(String id) {
        return documentProcessService.generateDocumentPreview(id);
    }

    @Override
    public String generateDocumentThumbnail(String id) {
        return documentProcessService.generateDocumentThumbnail(id);
    }

    @Override
    public String compressDocument(String id, Integer quality) {
        return documentProcessService.compressDocument(id, quality);
    }

    @Override
    public Boolean encryptDocument(String id, String password, String algorithm) {
        return documentProcessService.encryptDocument(id, password, algorithm);
    }

    @Override
    public Boolean decryptDocument(String id, String password) {
        return documentProcessService.decryptDocument(id, password);
    }

    @Override
    public Boolean addWatermark(String id, String watermarkText, String position) {
        return documentProcessService.addWatermark(id, watermarkText, position);
    }

    @Override
    public String mergeDocuments(List<String> documentIds, String userId) {
        // 修复返回类型不匹配问题 - 实现文档合并逻辑
        try {
            if (documentIds == null || documentIds.isEmpty()) {
                throw new IllegalArgumentException("文档ID列表不能为空");
            }

            if (documentIds.size() < 2) {
                throw new IllegalArgumentException("至少需要两个文档才能合并");
            }

            // 验证所有文档的权限
            for (String documentId : documentIds) {
                if (!validateDocumentOwnership(documentId, userId)) {
                    throw new RuntimeException("无权限合并文档: " + documentId);
                }
            }

            // 执行文档合并
            String mergedDocumentId = performDocumentMerge(documentIds, userId);

            log.info("文档合并完成: sourceIds={}, mergedId={}, userId={}", documentIds, mergedDocumentId, userId);
            return mergedDocumentId;

        } catch (Exception e) {
            log.error("文档合并失败: documentIds={}, userId={}", documentIds, userId, e);
            throw new RuntimeException("文档合并失败: " + e.getMessage());
        }
    }

    @Override
    public List<String> splitDocument(String id, String splitRule, String userId) {
        return documentProcessService.splitDocument(id, splitRule, userId);
    }

    @Override
    public String performOCR(String id) {
        return documentProcessService.performOCR(id);
    }

    @Override
    public Boolean validateDocument(String id) {
        return documentProcessService.validateDocument(id);
    }

    @Override
    public Boolean repairDocument(String id) {
        return documentProcessService.repairDocument(id);
    }

    // ========== DocumentStatisticsService 委托方法 ==========

    @Override
    public DocumentStatisticsVO getDocumentStatistics(String documentId) {
        return documentStatisticsService.getDocumentStatistics(documentId);
    }

    @Override
    public Boolean recordDocumentAccess(String documentId, String userId, String accessType) {
        return documentStatisticsService.recordDocumentAccess(documentId, userId, accessType);
    }

    @Override
    public Boolean incrementDownloadCount(String documentId, String userId) {
        return documentStatisticsService.incrementDownloadCount(documentId, userId);
    }

    @Override
    public Boolean incrementViewCount(String documentId, String userId) {
        return documentStatisticsService.incrementViewCount(documentId, userId);
    }

    @Override
    public Boolean incrementFavoriteCount(String documentId, String userId) {
        return documentStatisticsService.incrementFavoriteCount(documentId, userId);
    }

    @Override
    public Boolean decrementFavoriteCount(String documentId, String userId) {
        return documentStatisticsService.decrementFavoriteCount(documentId, userId);
    }

    @Override
    public Boolean updateDocumentRating(String documentId, String userId, Double rating) {
        return documentStatisticsService.updateDocumentRating(documentId, userId, rating);
    }

    @Override
    public Object getUserStatistics(String userId) {
        return documentStatisticsService.getUserStatistics(userId);
    }

    @Override
    public Object getCategoryStatistics(String categoryId) {
        return documentStatisticsService.getCategoryStatistics(categoryId);
    }

    @Override
    public Object getSystemStatistics() {
        return documentStatisticsService.getSystemStatistics();
    }

    @Override
    public Object getHotDocumentsStatistics(Integer limit) {
        return documentStatisticsService.getHotDocumentsStatistics(limit);
    }

    @Override
    public Object getAccessTrendStatistics(String documentId, Integer days) {
        return documentStatisticsService.getAccessTrendStatistics(documentId, days);
    }

    @Override
    public Integer cleanupExpiredStatistics(Integer days) {
        return documentStatisticsService.cleanupExpiredStatistics(days);
    }

    // ========== DocumentService 扩展方法 ==========

    @Override
    public List<DocumentVO> fullTextSearchDocuments(String searchText, String userId, Integer limit) {
        log.info("全文搜索文档: searchText={}, userId={}", searchText, userId);
        // 委托给搜索服务的高级搜索
        return documentSearchService.advancedSearchDocuments(searchText, null, null, userId, limit);
    }

    @Override
    public byte[] downloadDocument(String id, String userId) {
        log.info("下载文档: id={}, userId={}", id, userId);
        
        // 检查权限
        if (!checkDocumentPermission(id, userId, "download")) {
            throw new RuntimeException("无权限下载此文档");
        }
        
        // 记录下载
        incrementDownloadCount(id, userId);
        
        // 实现文档下载逻辑
        Document document = getById(id);
        if (document == null) {
            throw new RuntimeException("文档不存在");
        }

        // 从文件存储系统获取文件内容
        try {
            String filePath = document.getFilePath();
            if (filePath == null || filePath.trim().isEmpty()) {
                throw new RuntimeException("文档文件路径不存在");
            }

            log.info("下载文档文件: filePath={}", filePath);

            // 调用文件存储读取方法
            return readFileFromStorage(filePath);

        } catch (Exception e) {
            log.error("从文件存储系统获取文件内容失败: documentId={}", id, e);
            throw new RuntimeException("文件下载失败: " + e.getMessage());
        }
    }

    @Override
    public String previewDocument(String id, String userId) {
        log.info("预览文档: id={}, userId={}", id, userId);
        
        // 检查权限
        if (!checkDocumentPermission(id, userId, "view")) {
            throw new RuntimeException("无权限预览此文档");
        }
        
        // 记录访问
        incrementViewCount(id, userId);
        
        return generateDocumentPreview(id);
    }

    @Override
    public Boolean favoriteDocument(String documentId, String userId) {
        log.info("收藏文档: documentId={}, userId={}", documentId, userId);

        // 实现收藏逻辑
        // 1. 检查是否已收藏
        // 2. 添加收藏记录
        // 3. 更新统计

        // 检查文档是否存在和权限
        if (!checkDocumentPermission(documentId, userId, "read")) {
            throw new RuntimeException("无权限访问此文档");
        }

        incrementFavoriteCount(documentId, userId);

        return true;
    }

    @Override
    public Boolean unfavoriteDocument(String documentId, String userId) {
        log.info("取消收藏文档: documentId={}, userId={}", documentId, userId);

        // 实现取消收藏逻辑
        // 1. 检查是否已收藏
        // 2. 删除收藏记录
        // 3. 更新统计

        // 检查文档是否存在和权限
        if (!checkDocumentPermission(documentId, userId, "read")) {
            throw new RuntimeException("无权限访问此文档");
        }

        decrementFavoriteCount(documentId, userId);

        return true;
    }

    @Override
    public DocumentVO copyDocument(String sourceDocumentId, String newName, String userId) {
        log.info("复制文档: sourceDocumentId={}, newName={}, userId={}", sourceDocumentId, newName, userId);

        // 检查权限
        if (!checkDocumentPermission(sourceDocumentId, userId, "view")) {
            throw new RuntimeException("无权限复制此文档");
        }

        // 实现文档复制逻辑
        try {
            // 1. 获取源文档信息
            Document sourceDocument = getById(sourceDocumentId);
            if (sourceDocument == null) {
                throw new RuntimeException("源文档不存在");
            }

            // 2. 复制文件
            String newFilePath = copyDocumentFile(sourceDocument.getFilePath(), userId);

            // 3. 创建新文档记录
            Document newDocument = createCopiedDocument(sourceDocument, newFilePath, userId);
            save(newDocument);

            log.info("文档复制完成: sourceId={}, newId={}, userId={}", sourceDocumentId, newDocument.getId(), userId);
            return convertToVO(newDocument);

        } catch (Exception e) {
            log.error("文档复制失败: sourceId={}, userId={}", sourceDocumentId, userId, e);
            throw new RuntimeException("文档复制失败: " + e.getMessage());
        }
    }

    @Override
    public Boolean moveDocuments(List<String> documentIds, String categoryId) {
        log.info("移动文档: documentIds={}, categoryId={}", documentIds, categoryId);

        String userId = UserContext.getUserId();

        // 检查权限
        for (String documentId : documentIds) {
            if (!validateDocumentOwnership(documentId, userId)) {
                throw new RuntimeException("无权限移动文档: " + documentId);
            }
        }

        // 实现文档移动逻辑
        try {
            // 1. 验证目标分类存在
            if (!validateCategoryExists(categoryId)) {
                throw new RuntimeException("目标分类不存在: " + categoryId);
            }

            // 2. 批量更新文档分类
            com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper<Document> wrapper =
                new com.baomidou.mybatisplus.core.conditions.update.UpdateWrapper<>();

            wrapper.in("id", documentIds)
                   .set("category_id", categoryId)
                   .set("updater_id", userId)
                   .set("update_time", java.time.LocalDateTime.now());

            boolean updateResult = update(wrapper);

            // 3. 记录移动操作日志
            if (updateResult) {
                recordDocumentMoveOperation(documentIds, categoryId, userId);
            }

            log.info("文档移动完成: documentIds={}, categoryId={}, userId={}, result={}",
                    documentIds, categoryId, userId, updateResult);
            return updateResult;

        } catch (Exception e) {
            log.error("文档移动失败: documentIds={}, categoryId={}, userId={}",
                    documentIds, categoryId, userId, e);
            return false;
        }
    }

    @Override
    public List<DocumentVO> getDocumentVersions(String documentId) {
        log.info("获取文档版本列表: documentId={}", documentId);

        // 实现获取版本列表逻辑
        try {
            // 验证文档是否存在
            Document document = getById(documentId);
            if (document == null) {
                throw new RuntimeException("文档不存在");
            }

            // 获取文档的所有版本
            java.util.List<DocumentVO> versions = getDocumentVersionList(documentId);

            log.info("获取文档版本列表完成: documentId={}, versionCount={}", documentId, versions.size());
            return versions;

        } catch (Exception e) {
            log.error("获取文档版本列表失败: documentId={}", documentId, e);
            return new java.util.ArrayList<>();
        }
    }

    @Override
    public String createDocumentVersion(String documentId, String description, String userId) {
        log.info("创建文档版本: documentId={}, description={}, userId={}", documentId, description, userId);

        // 检查权限
        if (!validateDocumentOwnership(documentId, userId)) {
            throw new RuntimeException("无权限创建文档版本");
        }

        // 实现创建版本逻辑
        try {
            // 1. 复制当前文档
            Document currentDocument = getById(documentId);
            if (currentDocument == null) {
                throw new RuntimeException("文档不存在");
            }

            // 2. 创建版本记录
            String versionId = createDocumentVersionRecord(currentDocument, description, userId);

            // 3. 更新版本号
            updateDocumentVersionNumber(documentId, versionId);

            log.info("文档版本创建完成: documentId={}, versionId={}, userId={}", documentId, versionId, userId);
            return versionId;

        } catch (Exception e) {
            log.error("创建文档版本失败: documentId={}, userId={}", documentId, userId, e);
            return null;
        }
    }

    @Override
    public Boolean restoreDocumentVersion(String documentId, String versionId, String userId) {
        log.info("恢复文档版本: documentId={}, versionId={}, userId={}", documentId, versionId, userId);

        // 检查权限
        if (!validateDocumentOwnership(documentId, userId)) {
            throw new RuntimeException("无权限恢复文档版本");
        }

        // 实现版本恢复逻辑
        try {
            // 1. 获取版本信息
            DocumentVersionInfo versionInfo = getDocumentVersionInfo(documentId, versionId);
            if (versionInfo == null) {
                throw new RuntimeException("版本信息不存在");
            }

            // 2. 恢复文档内容
            boolean contentRestored = restoreDocumentContent(documentId, versionInfo);

            // 3. 更新当前版本标记
            if (contentRestored) {
                updateCurrentVersionMark(documentId, versionId);
                recordVersionRestoreOperation(documentId, versionId, userId);
            }

            log.info("文档版本恢复完成: documentId={}, versionId={}, userId={}, result={}",
                    documentId, versionId, userId, contentRestored);
            return contentRestored;

        } catch (Exception e) {
            log.error("恢复文档版本失败: documentId={}, versionId={}, userId={}", documentId, versionId, userId, e);
            return false;
        }
    }

    @Override
    public Integer cleanupExpiredDocuments() {
        log.info("清理过期文档");

        // 实现过期文档清理逻辑
        try {
            java.time.LocalDateTime cutoffDate = java.time.LocalDateTime.now().minusDays(30); // 30天前

            // 1. 查找过期文档
            java.util.List<Document> expiredDocuments = findExpiredDocuments(cutoffDate);

            int cleanedCount = 0;
            for (Document document : expiredDocuments) {
                try {
                    // 2. 删除文件
                    deleteDocumentFile(document.getFilePath());

                    // 3. 删除数据库记录
                    removeById(document.getId());

                    cleanedCount++;
                    log.debug("清理过期文档: id={}, name={}", document.getId(), document.getName());

                } catch (Exception e) {
                    log.error("清理单个过期文档失败: id={}", document.getId(), e);
                }
            }

            log.info("过期文档清理完成: totalFound={}, cleaned={}", expiredDocuments.size(), cleanedCount);
            return cleanedCount;

        } catch (Exception e) {
            log.error("清理过期文档失败", e);
            return 0;
        }
    }

    @Override
    public List<DocumentVO> getCategoryDocuments(String categoryId, String userId, Integer limit) {
        return getDocumentsByCategory(categoryId, userId, limit);
    }

    @Override
    public List<DocumentVO> getHotDocuments(String userId, Integer limit) {
        // 获取热门文档，考虑用户权限
        return getHotDocuments(limit);
    }

    @Override
    public Object getDocumentStorageStatistics(String userId) {
        log.info("获取文档存储统计: userId={}", userId);

        // 实现存储统计逻辑
        try {
            java.util.Map<String, Object> statistics = new java.util.HashMap<>();

            // 1. 统计用户文档数量
            long totalDocuments = getUserDocumentCount(userId);
            statistics.put("totalDocuments", totalDocuments);

            // 2. 统计存储空间使用
            long totalStorage = getUserTotalStorageSize(userId);
            statistics.put("totalStorage", totalStorage);
            statistics.put("totalStorageFormatted", formatStorageSize(totalStorage));

            // 3. 统计各类型文档分布
            java.util.Map<String, Object> typeDistribution = getUserDocumentTypeDistribution(userId);
            statistics.put("typeDistribution", typeDistribution);

            // 4. 统计最近活动
            java.util.Map<String, Object> recentActivity = getUserRecentActivity(userId);
            statistics.put("recentActivity", recentActivity);

            log.info("文档存储统计完成: userId={}, totalDocuments={}, totalStorage={}",
                    userId, totalDocuments, totalStorage);
            return statistics;

        } catch (Exception e) {
            log.error("获取文档存储统计失败: userId={}", userId, e);
            return new java.util.HashMap<>();
        }
    }

    // ========== 私有辅助方法 ==========

    /**
     * 执行文档合并
     */
    private String performDocumentMerge(java.util.List<String> documentIds, String userId) {
        // TODO: 实现真实的文档合并逻辑
        // 这里应该合并多个文档的内容，创建新的合并文档
        log.info("执行文档合并: documentIds={}, userId={}", documentIds, userId);
        return documentIds.get(0); // 临时返回第一个文档ID
    }

    /**
     * 复制文档文件
     */
    private String copyDocumentFile(String sourceFilePath, String userId) {
        // TODO: 实现真实的文件复制逻辑
        // 这里应该复制文件到新位置
        String newFilePath = sourceFilePath + "_copy_" + System.currentTimeMillis();
        log.info("复制文档文件: source={}, target={}", sourceFilePath, newFilePath);
        return newFilePath;
    }

    /**
     * 创建复制的文档
     */
    private Document createCopiedDocument(Document sourceDocument, String newFilePath, String userId) {
        Document newDocument = new Document();
        // 复制基本信息
        newDocument.setName(sourceDocument.getName() + "_副本");
        newDocument.setTitle(sourceDocument.getTitle());
        newDocument.setDescription(sourceDocument.getDescription());
        newDocument.setType(sourceDocument.getType());
        newDocument.setCategoryId(sourceDocument.getCategoryId());
        newDocument.setFilePath(newFilePath);
        newDocument.setCreatorId(userId);
        newDocument.setStatus(sourceDocument.getStatus());
        newDocument.setCreateTime(java.time.LocalDateTime.now());
        newDocument.setUpdateTime(java.time.LocalDateTime.now());
        return newDocument;
    }

    /**
     * 转换为VO
     */
    private DocumentVO convertToVO(Document document) {
        DocumentVO vo = new DocumentVO();
        org.springframework.beans.BeanUtils.copyProperties(document, vo);
        return vo;
    }

    /**
     * 验证分类是否存在
     */
    private boolean validateCategoryExists(String categoryId) {
        // TODO: 实现真实的分类验证逻辑
        // 这里应该查询分类表验证分类是否存在
        return true; // 临时返回true
    }

    /**
     * 记录文档移动操作
     */
    private void recordDocumentMoveOperation(java.util.List<String> documentIds, String categoryId, String userId) {
        // TODO: 实现文档移动操作记录
        log.info("记录文档移动操作: documentIds={}, categoryId={}, userId={}", documentIds, categoryId, userId);
    }

    /**
     * 获取文档版本列表
     */
    private java.util.List<DocumentVO> getDocumentVersionList(String documentId) {
        // TODO: 实现获取文档版本列表
        // 这里应该查询版本表获取所有版本
        return new java.util.ArrayList<>();
    }

    /**
     * 创建文档版本记录
     */
    private String createDocumentVersionRecord(Document document, String description, String userId) {
        // TODO: 实现创建版本记录
        // 这里应该在版本表中创建新记录
        String versionId = java.util.UUID.randomUUID().toString();
        log.info("创建文档版本记录: documentId={}, versionId={}, description={}", document.getId(), versionId, description);
        return versionId;
    }

    /**
     * 更新文档版本号
     */
    private void updateDocumentVersionNumber(String documentId, String versionId) {
        // TODO: 实现版本号更新
        log.info("更新文档版本号: documentId={}, versionId={}", documentId, versionId);
    }

    /**
     * 获取文档版本信息
     */
    private DocumentVersionInfo getDocumentVersionInfo(String documentId, String versionId) {
        // TODO: 实现获取版本信息
        return new DocumentVersionInfo(documentId, versionId);
    }

    /**
     * 恢复文档内容
     */
    private boolean restoreDocumentContent(String documentId, DocumentVersionInfo versionInfo) {
        // TODO: 实现文档内容恢复
        log.info("恢复文档内容: documentId={}, versionId={}", documentId, versionInfo.getVersionId());
        return true;
    }

    /**
     * 更新当前版本标记
     */
    private void updateCurrentVersionMark(String documentId, String versionId) {
        // TODO: 实现当前版本标记更新
        log.info("更新当前版本标记: documentId={}, versionId={}", documentId, versionId);
    }

    /**
     * 记录版本恢复操作
     */
    private void recordVersionRestoreOperation(String documentId, String versionId, String userId) {
        // TODO: 实现版本恢复操作记录
        log.info("记录版本恢复操作: documentId={}, versionId={}, userId={}", documentId, versionId, userId);
    }

    /**
     * 查找过期文档
     */
    private java.util.List<Document> findExpiredDocuments(java.time.LocalDateTime cutoffDate) {
        // TODO: 实现查找过期文档
        // 这里应该查询数据库找到过期的文档
        return new java.util.ArrayList<>();
    }

    /**
     * 删除文档文件
     */
    private void deleteDocumentFile(String filePath) {
        // TODO: 实现文件删除
        log.info("删除文档文件: filePath={}", filePath);
    }

    /**
     * 获取用户文档数量
     */
    private long getUserDocumentCount(String userId) {
        return count(new com.baomidou.mybatisplus.core.conditions.query.QueryWrapper<Document>()
                .eq("creator_id", userId)
                .eq("status", 1));
    }

    /**
     * 获取用户总存储大小
     */
    private long getUserTotalStorageSize(String userId) {
        // TODO: 实现用户总存储大小统计
        return 0L;
    }

    /**
     * 格式化存储大小
     */
    private String formatStorageSize(long bytes) {
        if (bytes < 1024) return bytes + " B";
        if (bytes < 1024 * 1024) return String.format("%.1f KB", bytes / 1024.0);
        if (bytes < 1024 * 1024 * 1024) return String.format("%.1f MB", bytes / (1024.0 * 1024));
        return String.format("%.1f GB", bytes / (1024.0 * 1024 * 1024));
    }

    /**
     * 获取用户文档类型分布
     */
    private java.util.Map<String, Object> getUserDocumentTypeDistribution(String userId) {
        // TODO: 实现文档类型分布统计
        return new java.util.HashMap<>();
    }

    /**
     * 获取用户最近活动
     */
    private java.util.Map<String, Object> getUserRecentActivity(String userId) {
        // TODO: 实现最近活动统计
        return new java.util.HashMap<>();
    }

    /**
     * 文档版本信息内部类
     */
    private static class DocumentVersionInfo {
        private String documentId;
        private String versionId;

        public DocumentVersionInfo(String documentId, String versionId) {
            this.documentId = documentId;
            this.versionId = versionId;
        }

        public String getDocumentId() { return documentId; }
        public String getVersionId() { return versionId; }
    }

    /**
     * 从存储系统读取文件
     */
    private byte[] readFileFromStorage(String filePath) {
        try {
            // TODO: 实现真实的文件存储读取逻辑
            // 这里应该根据存储类型选择不同的读取方式

            if (filePath == null || filePath.trim().isEmpty()) {
                throw new RuntimeException("文件路径为空");
            }

            log.info("从存储系统读取文件: filePath={}", filePath);

            // 这里应该实现真实的文件读取逻辑：
            // 1. 本地文件系统：Files.readAllBytes(Paths.get(filePath))
            // 2. 云存储：调用云存储SDK
            // 3. 分布式文件系统：调用相应API

            // 临时返回空数组
            return new byte[0];

        } catch (Exception e) {
            log.error("从存储系统读取文件失败: filePath={}", filePath, e);
            throw new RuntimeException("文件读取失败: " + e.getMessage());
        }
    }
}
